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IS 15496 (2004, Reaffirmed 2010) : Inspection and 
Maintenance of Gaseous Fire Extinguishing Systems- 
Practice. ICS 13.220.10 




Jawaharlal Nehru 
'Step Out From the Old to the New" 



-Code of 



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IS 15496 :2004 



Indian Standard 

INSPECTION AND MAINTENANCE OF GASEOUS 

FIRE EXTINGUISHING SYSTEMS — 

CODE OF PRACTICE 



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ICS 13.220.10 



© BIS 2004 

BUREAU OF INDIAN STANDARDS 

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG 

NEW DELHI 110002 

August 2004 Price Group 4 



Fire Fighting Sectional Committee, CED 22 



FOREWORD 

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Fire 
Fighting Sectional Committee had been approved by the Civil Engineering Division Council. 

This standard sets out requirements for the regular Inspection and Maintenance of Gaseous Fire 
Extinguishing Systems designed and installed in accordance with the appropriate standards for the 
installation of respective extinguishing systems. Regular maintenance includes inspection, testing and training 
procedures also. 

The purpose of the maintenance is to maintain the system in full operating condition at all times and also to 
ensure that the system would operate to the expected level of efficiency at any given time. Actuation, 
impairment and restoration of the protection shall be promptly recorded and also reported to the concerned 
authorities. 

Any troubles or impairments shall be rectified in a timely manner consistent with the hazard protected. 

Enclosure penetrations caused after the installations of the gaseous systems shall be efficiently sealed back. 
Unless this is attended to, the integrity of the enclosure will change, resulting in inadequate protection. 

For the purpose of deciding whether a particular requirement of this standard is complied with the final 
value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with 
IS 2 : I960 'Rules for rounding off numerical values ( revised)' . The number of significant places retained in the 
rounded off value should be the same as that of the specified value in this standard. 



fS 15496 : 2004 



Indian Standard 



INSPECTION AND MAINTENANCE OF GASEOUS 

FIRE EXTINGUISHING SYSTEMS — 

CODE OF PRACTICE 



1 SCOPE 

This standard lays down recommendations for 
inspection and maintenance of gaseous fire 
extinguishing systems like HFC227ea, HCFC Blend 
A,1G01,IG55,IG100,1G541. 

2 REFERENCES 

The standards given below contain provisions 
which through reference in this text, constitute 
provisions of this standard. At the time of 
publication, the editions indicated were valid. All 
standards are subject to revision, and parties to 
agreements based on this standard are encouraged 
to investigate the possibility of applying the most 
recent editions of the standards indicated below: 

IS No. Title 

2189:1999 Code of practice for selection, 

installation and maintenance of 
automatic fire detection and alarm 
system ( second revision ) 

15493:2004 Gaseous fire extinguishing 
systems — General requirements 

15517:2004 Gaseous fire extinguishing 
systems — HFC 227ea ( Hepta 
Fluoro Propare ) extinguishing 
systems 

15505:2004 Gaseous fire extinguishing 
systems — HCFC blend A 
extinguishing systems 

15506:2004 Gaseous fire extinguishing 

systems — IG 55 extinguishing 
systems 

15501:2004 Gaseous fire extinguishing 
systems — IG 541 extinguishing 
systems 

15525:2004 Gaseous fire extinguishing 
systems — IG 100 extinguishing 
systems 

15497:2004 Gaseous fire extinguishing 
systems — IG 01 extinguishing 
systems 



IS No. Title 

15528:2004 Gaseous fire extinguishing 
systems — Carbondioxide total 
flooding and local application 
( sub-floor and in-cabinet ), high 
and low pressure ( refrigerated ) 
systems 



3 INSPECTION, 
ASPECTS 



TESTING AND TRAINING 



3.1 Inspection and Tests 

A well planned and approved schedule is essential 
for the inspection and testing of systems, keeping 
in view the following: 

a) At least once a year, all systems shall be 
thoroughly inspected and tested for 
proper operation by competent personnel. 
Discharge tests are not necessary. 

b) The inspection report along with 
recommendations shall be filed and 
always available with the owner and the 
same shall be produced to the authorities 
concerned when demanded. 

c) At least once in six months, the agent 
quantity and pressure of the containers 
shall be checked and details logged in a 
register. 

d) For Halocarbon clean agents that are 
vapourizing liquids, if a container shows 
a loss in agent quantity of more than 
5 percent or a loss in pressure ( adjusted 
for room temperature ) of more than 
10 percent, it shall be refilled or replaced. 

e) For Inert gas clean agents that are not 
liquefied, pressure is an indication of 
agent quantity. If a container shows a 
loss in pressure ( adjusted for room 
temperature ) of more than 5 percent, it shall 
be refilled or replaced. 

f) In either case above, where container 
pressure gauges are used for checking 
pressure, they shall be compared to a 
separate calibrated device at least once a 
year. 



IS 15496:2004 



g) Where the amount of agent in the container 
is determined by special measuring 
devices, these devices shall be approved. 

h) All halocarbon clean agents removed from 
refillable containers during service or 
maintenance procedures shall be collected 
and recycled or disposed of in an 
environmentally sound manner and in 
accordance with existing laws and 
regulations. 

j) Factory-charged, non-refiUable containers 
that do not have a means of pressure 
indication shall have the agent quantity 
checked at least semiannually. If a 
container shows a loss in agent quantity 
of more than 5 percent, it shall be replaced. 
All factory-charged, non-refillable 
containers removed from useful service shall 
be returned for recycling of the agent or 
disposed of in an environmentally sound 
manner and in accordance with existing laws 
and regulations. 

k) For halocarbon clean agents, the date of 
inspection, gross weight of cylinder plus 
agent or net weight of agent, type of agent, 
person performing the inspection, and, 
where applicable, the pressure at a 
recorded temperature shall be recorded on a 
tag attached to the container. For inert gas 
clean agents, the date of inspection, type of 
agent, person performing the inspection, 
and the pressure at a recorded temperature 
shall be recorded on a tag attached to the 
container. 

3.2 Container Test 

The gaseous agent containers covered under 
IS 15517:2004,18 15505 : 2004, IS 15506:2004, 
IS 15501 : 2004, IS 15525 : 2004, IS 15497 : 2004 and 
IS 15528 : 2004 shall be inspected, keeping in view 
the following: 

a) Clean agent containers as approved by 
Chief Controller of Explosives, Nagpur 
shall not be recharged without retesting if 
more than 5 years have elapsed since the 
date of the last test and inspection. For 
halocarbon agent storage containers, the 
retest shall be permitted to consist of a 
complete visual inspection. 

Transporting charged containers that 
have not been tested within 5 years shall 
not be allowed. Guidelines of Chief 
Controller of Explosives, Nagpur shall be 
followed in this regard. 

b) Cylinders continuously in service without 



discharging shall be given a complete 
external visual inspection every 5 years or 
more frequently if required. The visual 
inspection shall be in accordance with the 
guidelines of Chief Controller of 
Explosives, Nagpur except that the 
cylinders need not be emptied or stamped 
while under pressure. Inspections shall be 
made only by competent personnel and 
the results recorded on both of the following: 

1) A record tag permanently attached to 
each cylinder, and 

2) A suitable inspection report. 

c) A completed copy of the inspection 
report shall be furnished to the owner of 
the system or an authorized representative. 
These records shall be retained by the 
owner for the life of the system. 

d) Potentially the most serious hazard of 
defective container is the sudden uncontrolled 
release of pressure or ejection of parts. It 
could be caused due to any one of the 
following causes: 

1) Corrosion, wear or damage to threads of 
any pressure retaining parts; and 

2) Extensive general corrosion or severe 
pitting. 

Where external visual inspection indicates that 
the container has been damaged, the same shall be 
sent for hydraulic testing. However, hydraulic test 
shall be carried out after five years or after discharge 
by the authorized agency. 

3.3 Hose Test 

3.3.1 All system hose shall be examined annually for 
damage. If visual examination shows any deficiency, 
the hose shall be immediately replaced or tested as 
specified in 3,3.2 below. 

3.3.2 Testing 

a) All hoses shall be tested every 5 years. 

b) All hoses shall be tested at VA times the 
maximum container pressure at 54,4°C. 
The testing procedure shall be as follows: 

1) The hose is removed from any 
attachment. 

2) The hose assembly is then placed in 
a protective enclosure designed to 
permit visual observation of the test. 

3) The hose must be completely filled 
with water before testing, 

4) Pressure then is applied at a rate-of- 
pressure rise to reach the test pressure 



IS 15496 : 2004 



within a minimum of 1 min. The test 
pressure is maintained for 1 full min. 
Observations are then made to note 
any distortion or leakage. 

5) If the test pressure has not dropped or 
if the couplings have not moved, the 
pressure is released. The hose assembly 
is then considered to have passed the 
hydrostatic test if no permanent 
distortion has taken place. 

6) Hose assembly passing the test must 
be completely dried internally. If heat 
is used for drying, the temperature 
must not exceed the manufacturer's 
specifications. 

7) Hose assemblies failing a hydrostatic 
test must be marked and destroyed and 
be replaced with new assemblies. 

8) Each hose assembly passing the 
hydrostatic test is marked to show the 
date of test. 

3.4 Enclosure Inspection 

At least every 12 months, the enclosure protected 
by these agents shall be thoroughly inspected to 
determine if penetrations or other changes have 
occurred that could adversely affect agent leakage 
or change volume of hazard or both. Where the 
inspection indicates conditions that could result 
in inability to maintain the clean agent 
concentration, they shall be corrected. If 
uncertainty still exists, the enclosures shall be 
retested for integrity. 

3.5 Training 

All persons who could be expected to inspect, test, 
maintain, or operate fire extinguishing systems shall 
be thoroughly trained and kept thoroughly trained 
in the functions they are expected to perform. 

Personnel working in an enclosure protected by these 
agents shall receive training regarding agent safety 
issues. 

4 MAINTENANCE OF INSTALLED SYSTEMS 

4.1 Maintenance of Installation 

4.1.1 It is essential that regular maintenance of 
gaseous systems is undertaken to ensure an 
operational condition and to prevent leakage or 
inadvertent discharge. 

4.1.2 Calibrated test equipment and recognized 
procedures shall be used. 

4.1.3 Regular maintenance is classified into four 
levels which shall be performed as follows: 



a) Weekly, only where the appropriate 
authority deems it necessary; 

b) Monthly on complete systems; 

c) Six-monthly on complete systems that do 
not incorporate means to determine 
container contents; 

d) Yearly on complete systems; and 

e) Container test after 5 years. 
NOTES 

1 Maintenance should be carried out only by 
persons having qualifications and experience 
suitable for the particular work in which they are 
engaged. 

2 The manufacturer may have additional 
requirements beyond that specified in this 
standard. 

3 The arrangements for maintenance should 
ensure that a person is available on call at all 
times to provide service in the event of any fault 
developing at the installation. 

4.2 Records 

All system attendances, for example, inspection, 
testing, service and maintenance procedures, 
shall be systematically recorded by date with 
signed entries in the logbook maintained on the 
site ( see 6.2 ). In addition, a copy of all attendance 
records should be forwarded to the owner. The 
property owner or occupier shall maintain a record 
of maintenance carried out on the gaseous systems. 
The maintenance record system shall contain 
the classification ( weekly, monthly, six-monthly or 
yearly ) and date of maintenance, any defects and any 
consequent remedial action or advice given by the 
service person, with any additional action or advice 
by the service person. 

The maintenance record system shall be available 
for the property at all times and produced to the 
authorities concerned when demanded. 

NOTE — The maintenance record system may be in 
the form of a logbook or a computer based record system 
or other appropriate permanent record system. 

4.3 Precautions 

Prior to commencing any inspection, testing or 
maintenance procedures, the service person shall carry 
out the following precautionary procedures as 
applicable: 

a) Inform the building owner that 
maintenance is to be carried out. 

b) Inform the fire control station, where 
testing will transmit a fire alarm signal 
( where fire stations are hooked with the 
control panel ). 



18 15496:2004 



c) Where fitted, close lock-off valve and in 
addition ensure that all extinguishant 
actuating circuits are isolated or firing 
mechanisms are removed to ensure that 
testing or that other maintenance 
procedures cannot cause discharge of any 
extinguishant. 

d) Set the detection and alarm system in the 
appropriate test mode and ensure that 
ancillary facilities, systems and air- 
handling plant ( including smoke exhaust 
and stairwell pressurization systems, 
evacuation warning systems, and the like ), 
where they are not to be tested, are isolated 
to a void inadvertent operation. 

e) On completion of any inspection, testing 
or maintenance procedure, the service 
person shall ensure that all controls are 
returned to the normal condition and re- 
establish the systems integrity. 

NOTE — The action to be taken when any 
function is isolated should be covered by the 
maintenance contract. When any section of an 
installation is to be isolated, the owner should be 
notified and in turn should advise the appropriate 
authority. 

5 MAINTENANCE PROCEDURES 

5.1 Weekly 

Where required, the weekly maintenance shall be 
performed as follows: 

a) Isolate extinguishant supply and 
ancillaries in accordance with 4.3. 

b) Check the proper operation of all associated 
visual alarm indicators by initiating a 
simulated fire alarm on an alarm zone 
facility. 

The above test shall be carried out in a 
manner acceptable to the fire control station 
if connected. 

c) Check the satisfactory operation of the fire 
alarm bell. 

d) Reset alarm zone facility. 

e) On corqpletion of testing, to re-establish 
the system's integrity, ensure that all 
switches are in the correct operating 
position. Inform the building owner or 
agent of any items requiring corrective 
action. 

f) Record the results of weekly maintenance 
procedures in the log, including whether 
the fire alarm signal from the alarm zone 
facility was received at the fire control 
station ( see 6.2 ). 



5.2 Monthly 

The monthly maintenance procedure shall be 
performed as follows: 

a) Isolate extinguishant supply and 
ancillaries in accordance with 4.3. 

b) Initiate a simulated fire alarm on an alarm 
zone facility so as to transmit an alarm to 
the fire control station. Check the proper 
operation of all associated visual alarm 
indicators. Check that the alarm was 
correctly received at the fire control 
station. 

c) This test shall be carried out in a manner 
acceptable to the fire control station. 

d) Check the satisfactory operation of the 
fire alarm bell. 

e) Reset alarm zone facility to normal. 

f) Test each alarm zone facility to confirm 
its ability to operate the master alarm 
facility. 

g) Check that all visual land audible 
indicators are operating correctly. 

h) Check that all control and indicating 
equipment is in a clean and operational 
condition, and effectively dust sealed. 

h) Ensure that all fire indicator panels, 
extinguishant local control stations ( LCS ), 
repeater panels and mimic panel are clearly 
visible and readily accessible. 

j) Simulate fault conditions on all alarm 
zones to ensure that fault indicators, both 
audible and visual, where applicable, are 
operating correctly from each alarm zone 
facility. 

k) Check the battery condition by operating 
the battery test facility for 1 min, and record 
the battery condition in the log. 

m) Inspect all extinguishant containers, 
manual mechanical release mechanisms and 
all other ancillary equipment to ensure they 
are secure, undamaged and unobstructed. 

n) Where applicable, check and record the 
container gauge pressures. Any container 
showing a loss in pressure exceeding 
10 percent of the nominal filling pressure, 
adjusted for temperature change from 
initial fill at the applicable reference 
temperature, shall be reported to the owner 
or agent for corrective action. 

p) Check the function of all extinguishant 
manual initiate switches and the 
extinguishant inhibit switch on each LCS. 



IS 15496 : 2004 



q) Ensure that all discharge nozzles are not 
obstructed and are correctly aligned. Carry 
out a visual inspection on all exposed pipe 
work, support and mechanical controls. 

r) Ensure that all warning and instruction 
signs, as required, are correctly displayed 
and unobstructed and that all controls, 
valves, switches, and the like, are properly 
identified. 

s) On completion of testing, to re-establish 
the system's integrity, ensure that all 
controls are returned to the normal condition. 

t) Record the results of monthly maintenance 
procedures in the log, including all items 
requiring corrective action, adjustment and 
the like (see 6.2). 

u) Check that items previously recorded as 
requiring attention have been attended to, 
or record the reasons why corrective actions 
have not been completed. 

v) Inform the building owner or agent that 
maintenance is completed and of any 
items requiring corrective action, obtain all 
necessary signatures in the logbook. 

5.3 Six-Monthly 

The six-monthly maintenance procedure shall be 
performed as follows: 

a) Isolate extinguishant supply and ancillaries 
in accordance with 4.3. 

b) Check and record the amount of extinguishant 
in each container by weight or liquid level. 

NOTE — Pressures and liquid levels in 
extinguishant container can vary considerably 
with temperature change. There may be a 
considerable time delay between changes in 
ambient temperature and the corresponding 
changes in the extinguishant container pressure or 
level. Any liquid level measurement should be 
reference to a datum, established at a known 
temperature. 

c) Perform monthly maintenance procedures 
in accordance with 5.2, items (b) to (v) 
inclusive. 

5.4 Yearly 

The yearly maintenance procedure shall be performed 
as follows: 

a) Isolate extinguishant supply and 
ancillaries in accordance with 4.3. 

b) Perform monthly maintenance procedures 
in accordance with 5.2(b) to 5.2(r), 
inclusive. 

c) Inspect all detectors as per IS 2189 and 



sampling points for any condition, which 
is likely to adversely affect their 
operation, such as deposition of dust or 
coating of paint. 

d) Remove at least one detector on each alarm 
zone circuit and confirm that the fault signal 
is registered at the appropriate alarm zone 
facility. 

e) Determine the sensitivity of all detectors. 
This may take the form of either: 

1) testing of a detector in-situ; or 

2) removal of a detector and its 
replacement by a detector which has 
been checked and calibrated by the 
supplier. 

f) Check that an alarm on each detector registers 
on the correct alarm zone facility. 

NOTE — This may require the owner or agent 
to provide other personnel to reset or restart 
ancillary facilities. 

g) Measure and record the time delay between 
any detector circuit's initiation of 
extinguishant release and receipt of the 
operation signal at the actuators. 

h) Check the operation of all remote 
ancillary control facilities, including door 
closers, evacuation warning systems, air- 
handling systems and the like, and ensure 
that each controlled device can be correctly 
activated. 

j) Check the operation of all mechanical 
release devices. 

k) Check the operation of all illuminated 
signs and audible indicators. 

m) Check the correct operation of the power 
supply supervision alarm, if applicable, by 
disconnecting all power supplies to the 
fire indicator panel. 

n) Inspect control and indicating equipment 
component for evidence of deterioration. 

p) Check and record all container details 
for compliance with requirements for 
periodic inspection and pressure testing in 
accordance with the standard appropriate to 
the container used. 

q) Ensure that all discharge nozzles are not 
obstructed and are correctly aligned. Carry 
out a visual inspection on all accessible 
pipe work, supports and mechanical 
controls. 

r) Non-electrical detection devices and 
manually operated devices shall be verified 
in accordance with the manufacturer's 



IS 15496 :2004 



procedure. 

s) Where applicable, check the electrical 
resistance of actuators and insulation of 
actuators to earth and replace them where 
appropriate. Pyrotechnic actuators shall be 
replaced in accordance with the 
manufacturer's specifications. 

t) Check for correct operation of directional 
valves. 

u) Perform a full system function check by 
initiating detector alarms and checking the 
response of container valve actuating 
circuits at the extinguishant containers. 

This check shall include the operation of 
the valve actuators, where this can be done 
without discharging extinguishant or 
damaging the actuator in which case the 
test shall be carried out using a device to 
simulate actuation. Where various 
combinations of detector circuits can 
initiate an extinguishant discharge, each 
combination shall be checked. 

v) Verify enclosure volume. 

w) Check for building alterations, changes in 
the environment, openings or other factors 
that could: 

1) cause inadvertent discharge of 
extinguishant, 

2) allow leakage of extinguishant from the 
protected area, and 

3) require modification to the system. 

Where the building has been altered, 
conduct an additional check for compliance 
with design concentration and, if necessary, 
conduct a full discharge test. 

NOTE — Leakage rate may be obtained by the 
fan pressurization technique. 

y) On completion of testing to re-establish 
the systems integrity ensure all controls are 
returned to the normal condition. 

z) Record the results of yearly maintenance 
procedures in the log, including details 
for all equipment that does not pass 
visual inspection or fails to operate 
satisfactorily. Notify the owner or agent 
of any deficiencies within the installation 
and obtain all necessary signatures in the 
logbook. 

NOTE — Prior to yearly maintenance procedures, 
the maintenance provider should give the owner 
or agent sufficient notice of testing to allow time 
for witnessing to be arranged. 



6 MAINTENANCE DOCUMENTATION 

6.1 General 

Maintenance documentation shall be provided for each 
gaseous system and shall include the following: 

a) Installer's report as specified in the 
appropriate installation standard. 

b) Installer's statement, as-installed diagrams, 
and commissioning test report as specified 
in IS 15493 : 2004 for the control and 
indicating equipment. 

The installer's statement, as-installed 
diagrams, and commissioning test report shall 
be prepared on durable, good quality paper, 
clearly legible and contained in a plastic cover 
or, alternatively, bound into the operator's 
manual 

c) Log — The maintenance documentation given 
above shall be housed in a secure location 
at the fire indicator panel, or as otherwise 
approved by the appropriate authority. 

The documentation shall describe the state of the 
installation, as it currently exists. If any changes are 
made to the installation, the relevant records shall be 
updated, that is, installer's statement, as-installed 
diagrams, operator's manual, and the like. 

6.2 Record System 

A maintenance record system shall be provided to 
sequentially register all known alarms, faults, 
disconnections, discharges and all maintenance 
and inspection procedures carried out so that there 
is a composite record of all events related to the 
installation. It shall include the following: 

a) Name of owner; 

b) Name of maintenance organization ( if 
hired); 

c) Identification of the system; 

d) Details of weekly, monthly, six-monthly 
and yearly maintenance procedures {see 
Annex A ); 

e) Container pressure report; and 

f) A report section for attendances apart 
from maintenance procedures. 

Where a logbook is used it shall be substantially 
bound ( not in loose-leaf format ) and shall have 
numbered pages in triplicate. The logbook shall 
include the signatures of the owner and service 
person. A required distribution of copies printed on 
each page shall be as follows: 



a) Original Owner/occupier 

b) Duplicate Service person 

c) Triplicate Retain in book 

The maintenance record system shall be available for 



IS 15496: 2004 



the property at all times. 



NOTE — The maintenance record system may be in 
the form of a logbook or a computer-based record system 
or other appropriate permanent record system. 



ANNEX A 
( Clause 6.2 ) 

SYSTEM — LOGBOOK REPORT 

Month 

Inspection, Testing, and Maintenance Procedures 

Maintenance Organization Premises 

Address 



NOTES 

1 Give details of all unsatisfactory items in report section. Refer to operations manual for commissioning test report. 

2 Place a ( ^ ) in box where item is satisfactory. 

3 Place a ( X ) in box where item is unsatisfactory. 

4 Tests not applicable where shaded. 

SI No. 



Item 



(1) (2) 

1) Fully isolate extinguishant supply 

2) Fire alarm signal simulation 

3) Fire alarm bell or warning device 
operation 

4) Fire alarm signal received at fire 
control station ( if applicable ) 

5) Alarm zone facility operation 

6) Indicate lights correct operation 

7) All alarm bells and signalling devices 
operation 

8) Battery condition 

9) CIE operational and clean 

10) All FIP, LCS and other panels clearly 
visible and readily accessible 

11) Fault conditions simulation on all 
alarm zones and ensure: 

i) fault annunciators operative, and 
ii) audible/visual indication operative. 



Periodical Check 



Weekly Monthly Six-monthly Yearly 
(3) (4) (5) (6) 



5S 15496 : 2004 

67 No. 



Item 



Periodical Check 



(1) (2) 

12) Extinguishant containers, other 
equipment secure, undamaged 

13) Container gauge pressures recorded 
( Refer report ) 

14) Discharge nozzles 

15) LCS unit operational 

16) Signs and controls checked 

17) Check and record amount of 
extinguishant in each container by 
weight or liquid level 

18) Inspect all detectors and sampling 
points ( fault signal registration for each 
alarm zone ) 

19) Detector and sampling point testing, 
as appropriate 

20) Correct operation of all ancillary 
control facilities 

21) Operation of all manual release points 

22) Check operation of signs 

23) Power supply supervision alarm 

24) Control and indicating equipment 
component inspection for deterioration 

25) Container compliance with Chief 
Controller of Explosives, Nagpur 

26) Actuators checked 

27) Non-electrical and manually operated 
detection devices 

28) Directional valves operational 

29) Full function test 

30) All controls returned to normal, 
extinguishant supply reconnected 

31) Building modifications, opening 
identified 

32) Leakage test conducted 

33) Correction of items ( Refer report ) 

34) Building owner informed, corrective 
action identified 

35) Time delay recorded 



Weekly Monthly Six-monthly Yearly 
(3) (4) (5) (6)